Electron discharge device



May 24, 1932- NACHUMSOHN ELECTRON DISCHARGE DEVICE Filed DeG. 29, 1925 Imfentor; w

Patented May 24, 1932 UNITED STATES IRVING NACHUMSOHN, OF CHICAGO, ILLINOIS ELECTRON DISCHARGE DEVICE Application mea December 29, 1926. serial No. iwf/43.

My invention relates to the improvement in an electron discharge device and more particularly to such types having a heated electron emitting area. It consists of the combinations, constructions and arrangements hereinafter set forth illustrated in the accompanying drawings, and `more particularly pointed out in the appended claims.

Among the objects of my invention are: to

provide a device of the character vdescribed that can be used in a large number of electrical circuits, particularly in connection with audio and radio frequency currents; to provide a device of the class described that can be used as an amplifier or rectifier of radio frequency currents and the like; to provide improved structure and arrangement of parts, in a device of the class described, that will permit of accurate and rapid assembling of elements in the manufacture thereof; to provide structure and means for maintaining a given alignment of the elements with respect to each other; to obviate the necessity of employing reentrant stems commonly employed in ordinary structures of this class for supporting the internal elements of the device; to rovide arrangement of parts that will permit of compactness of the completed unit.

Further objects will become readily ap parent to those skilled in the art of manufacturing vacuum tubes in connection with the structure described in the sequel; for example the elimination of the commonly employed re-entrant stems together with arrangement of parts are such that in multiple production a plurality of the assembled units, only one of which is shown in Fig. 2, within the vessel can be disposed co-axially in a comparatively long glass tube and one or both ends of said tube connected to the vacuum pump or exhaust line. Thus it can be seen that the long glass tube can be exhausted and thereafter the individual presses (as at 18, Figs. 2 and 4) formed, following which the long tube can be divided into the ultimate individual units, or vessels, as shown at 1. Also, because of the absence of the comparatively large space between the elements and the walls of the vessel, less gas will have to beexhausted from the individual vessels than with conventional types. Y

Other objects and advantagesV will appear as the'speciication progresses withreference to the accompanying drawings andthe novel features willbe particularly pointed out in the appended claims. j f In the drawings Fig. 1 is an exterior showmg of the device; Fig. 2.is asection along line 2 2 of Fig. 1; Fig. 3 is a section along l1ne 3 3 of Fig. 2; Fig. 4 is a fragmentary section along line 4 4 of Fig. 2; Fig. 5 is an enlarged showing of a part of the structure.

In Figs. 1 and 2 the vacuum vesselfisv shown at 1. Disposed adjacent the Walls thereof and in longitudinal relation thereto is a tubular anode or plate2 made of nickel, molybdenum, tantalum, or any other suitable material. Fastened into the ends of plate 2 are insulating member 3 (Fig. 5,). Said members, preferably made of a refractory insulating material such as porcelain are provided with a shoulder 4 adapted to receive a helical` grid member 5, longitudinally of which is a reenforcingbar4 6. `The remote ends of said bar are fastened into holes 7 of members 3 and one of said ends extends beyond its support Where it is connected at 8 to a leadin wire 9.

(lo-axially with the plate and grid is the cathode or electron-emitting element 10, shown in the preferred form as a filament Wire terminating into conductors 11 and 12. These conductors are disposed in holes 13 of members 3. Conductor 11 is connected to lead-in Wire 14 and conductor 12 is connected to one end of a conical spring 15, the other end of which is connected to lead-in wire 16. The purpose of the spring is to maintain a tension on the filament thereby avoiding looseness of the latter.

A lead-in wire 17 is connected to the plate 2 and, as do the other lead-in wires, extends externally of the vessel through a press or seal 18 in a manner well known to those familiar in the art.

External connection to the filament is provided by means of sleeves 19 to which are soldered at 20, the leads 14 and 16. Said sleeves are fastened about the ends of the vessel 1. Insulating Washers 21 having eyelets 22 secured in the centres thereof are fastened in the outermost ends of sleeves 19. The grid and plate lead-in Wires pass through these eyelets and are soldered thereto.

Any suitable method of evacuating the vessel may be employed.

It is obvious that the invention is not limited in its scope to the particular type shown in the preferred forms and that certain portions thereof may be utilized Without the adoption of its entirety.

I claim:

1. A triode assembly comprising a vessel, leads extending internally of said vessel from the exterior thereof, a plurality of elements Within said vessel and supported directly thereby in respective connection with said leads, one of said elements having its exterior surface in direct Contact with the interior surface of said vessel and common spacing means for all of said elements for maintaining a predetermined spaced relation therebetween.

2. In a device of the character described, a vessel, a plurality of external presses, conductors extending internally of said vessel from the exterior thereof through said presses, a plurality of elements Within said vessel respectively connected with said Conductors, one of said elements adapted to be heated by conducting current therethrough by said conductors, an element surrounding said heated element and maintained in predetermined relation thereto by spacing means confined to the ends of said elements, a hole in vsaid spacing means from Which said heated element is supported and another portionof said spacing means from which said second named element is supported and a plurality of contact-retaining sleeves disposed externally of said vessel, adjacent said presses and said spacing means.

IRVING NACHUMSOHN. 

